B3055

DTC B3055

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC B3055 00
- No Transponder Modulation or No Transponder

Circuit/System Description

Without BTM/ATH

When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the key is energized by the exciter coils surrounding the ignition lock cylinder. The transponder transmits a signal to the body control module (BCM). The BCM then compares this value to a value stored in memory. If the value is correct, the BCM will send the prerelease password via the serial data circuit to the engine control module (ECM). If the learned key code does not match or a transponder value is not received, the BCM will send the start disable password to the ECM.

With BTM/ATH

When a keyless entry transmitter is inserted into the transmitter pocket/slot and the ignition mode switch is pressed, the transponder embedded in the transmitter is energized by the immobilizer antenna exciter coil. The transponder transmits a signal to the body control module (BCM). The BCM then compares this value to a value stored in memory. If the value is correct, the BCM will send the prerelease password via the serial data circuit to the engine control module (ECM). If the learned key code does not match or a transponder value is not received, the BCM will send the start disable password to the ECM.

Conditions for Running the DTC

Ignition is in the Accessory or Run position.

Conditions for Setting the DTC

The BCM is unable to measure the ignition key transponder value.

Action Taken When the DTC Sets

* Vehicle starting will be disabled.
* The security indicator will illuminate. A service message will be displayed in the driver information center.

Conditions for Clearing the DTC

* A current DTC will be cleared when the BCM detects a valid transponder value from the ignition key.
* A history DTC will be cleared after 100 malfunction-free ignition cycles.

Reference Information
Schematic Reference

Immobilizer Schematics Immobilizer Schematics
Connector End View Reference

Component Connector End Views Sunshade - Left (D6I)
Description and Operation

Immobilizer Description and Operation Immobilizer
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify that DTC B1370, B1380, or B1441 is not set.

• If any of the DTCs are set
Refer to DTC B1370-B1379, B1380-B1389, or B1440-B1443 Wiring Systems and Power Management.

• If none of the DTCs are set

3. Verify the scan tool BCM Accessory parameter changes between Active and Inactive when turning the ignition ON and OFF.

• If the parameter does not change
Refer to Power Mode Mismatch Power Mode Mismatch.

• If the parameter changes

4. Verify all available keys are correct for the vehicle. This can be accomplished by comparing the part number that is laser etched on the key to the part number listed in the parts catalog.

• If a key is not correct
Replace the key.

• If all keys are correct

5. Verify the scan tool BCM Key Part Number parameter displays a Key Part Number when turning the ignition ON with each key.

• If a Key Part Number is not read
Replace the appropriate key.

• If a Key Part Number is read for each key

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Key with Integrated Transmitter Programming (without BTM) Key with Integrated Transmitter Programming (without BTM)Key with Integrated Transmitter Programming (with BTM) Key with Integrated Transmitter Programming (with BTM)